/**  
* @Title: QrCodeUtils2.java
* @Package com.lemon.utils
* @Description: (一句话阐述):
* @author Ran_cc
* @date 2018年11月2日
* @version V1.0  
*/
package com.lemon.utils;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * <p>Title: QrCodeUtils2</p>
 * <p>Description: 
 * </p>
 * <p>Company: </p>
 * @author Ran_cc
 * @date 2018年11月2日
 * @版本 V 1.0 
 */
public class QrCodeUtils2 {
	private static final String CHARSET = "utf-8";
	private static final String FORMAT = "PNG";
	// 二维码尺寸  
	private static final int QRCODE_SIZE = 300;
	// LOGO宽度  
	private static final int LOGO_WIDTH = 60;
	// LOGO高度  
	private static final int LOGO_HEIGHT = 60;

	private static BufferedImage createImage(String content , String logoPath , boolean needCompress) throws Exception {
		Hashtable<EncodeHintType , Object> hints = new Hashtable<EncodeHintType , Object>();
		hints.put(EncodeHintType.ERROR_CORRECTION , ErrorCorrectionLevel.H);
		hints.put(EncodeHintType.CHARACTER_SET , CHARSET);
		hints.put(EncodeHintType.MARGIN , 1);
		BitMatrix bitMatrix = new MultiFormatWriter().encode(content , BarcodeFormat.QR_CODE , QRCODE_SIZE ,
				QRCODE_SIZE , hints);
		int width = bitMatrix.getWidth();
		int height = bitMatrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x , y , bitMatrix.get(x , y) ? 0xFF000000 : 0xFFFFFFFF);
			}
		}
		if (logoPath == null || "".equals(logoPath)) {
			return image;
		}
		// 插入图片  
		QrCodeUtils2.insertImage(image , logoPath , needCompress);
		return image;
	}

	/**
	 * 插入LOGO
	 *
	 * @param source
	 *                     二维码图片
	 * @param logoPath
	 *                     LOGO图片地址
	 * @param needCompress
	 *                     是否压缩
	 * @throws Exception
	 */
	private static void insertImage(BufferedImage source , String logoPath , boolean needCompress) throws Exception {
		File file = new File(logoPath);
		if (!file.exists()) {
			throw new Exception("logo file not found.");
		}
		Image src = ImageIO.read(new File(logoPath));
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) { // 压缩LOGO  
			if (width > LOGO_WIDTH) {
				width = LOGO_WIDTH;
			}
			if (height > LOGO_HEIGHT) {
				height = LOGO_HEIGHT;
			}
			Image image = src.getScaledInstance(width , height , Image.SCALE_SMOOTH);
			BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = tag.getGraphics();
			g.drawImage(image , 0 , 0 , null); // 绘制缩小后的图  
			g.dispose();
			src = image;
		}
		// 插入LOGO  
		Graphics2D graph = source.createGraphics();
		int x = (QRCODE_SIZE - width) / 2;
		int y = (QRCODE_SIZE - height) / 2;
		graph.drawImage(src , x , y , width , height , null);
		Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
		graph.setStroke(new BasicStroke(3f));
		graph.draw(shape);
		graph.dispose();
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 * 二维码文件名随机，文件名可能会有重复
	 *
	 * @param content
	 *                     内容
	 * @param logoPath
	 *                     LOGO地址
	 * @param destPath
	 *                     存放目录
	 * @param needCompress
	 *                     是否压缩LOGO
	 * @throws Exception
	 */
	public static String encode(String content , String logoPath , String destPath , boolean needCompress)
			throws Exception {
		BufferedImage image = QrCodeUtils2.createImage(content , logoPath , needCompress);
		mkdirs(destPath);
		String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
		ImageIO.write(image , FORMAT , new File(destPath + "/" + fileName));
		return fileName;
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 * 调用者指定二维码文件名
	 *
	 * @param content
	 *                     内容
	 * @param logoPath
	 *                     LOGO地址
	 * @param destPath
	 *                     存放目录
	 * @param fileName
	 *                     二维码文件名
	 * @param needCompress
	 *                     是否压缩LOGO
	 * @throws Exception
	 */
	public static String encode(String content , String logoPath , String destPath , String fileName ,
			boolean needCompress) throws Exception {
		BufferedImage image = QrCodeUtils2.createImage(content , logoPath , needCompress);
		mkdirs(destPath);
		fileName = fileName.substring(0 , fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length()) + "."
				+ FORMAT.toLowerCase();
		ImageIO.write(image , FORMAT , new File(destPath + "/" + fileName));
		return fileName;
	}

	/**
	 * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．
	 * (mkdir如果父目录不存在则会抛出异常)
	 * 
	 * @param destPath
	 *                 存放目录
	 */
	public static void mkdirs(String destPath) {
		File file = new File(destPath);
		if (!file.exists() && !file.isDirectory()) {
			file.mkdirs();
		}
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 *
	 * @param content
	 *                 内容
	 * @param logoPath
	 *                 LOGO地址
	 * @param destPath
	 *                 存储地址
	 * @throws Exception
	 */
	public static String encode(String content , String logoPath , String destPath) throws Exception {
		return QrCodeUtils2.encode(content , logoPath , destPath , false);
	}

	/**
	 * 生成二维码
	 *
	 * @param content
	 *                     内容
	 * @param destPath
	 *                     存储地址
	 * @param needCompress
	 *                     是否压缩LOGO
	 * @throws Exception
	 */
	public static String encode(String content , String destPath , boolean needCompress) throws Exception {
		return QrCodeUtils2.encode(content , null , destPath , needCompress);
	}

	/**
	 * 生成二维码
	 *
	 * @param content
	 *                 内容
	 * @param destPath
	 *                 存储地址
	 * @throws Exception
	 */
	public static String encode(String content , String destPath) throws Exception {
		return QrCodeUtils2.encode(content , null , destPath , false);
	}

	/**
	 * 生成二维码(内嵌LOGO)
	 *
	 * @param content
	 *                     内容
	 * @param logoPath
	 *                     LOGO地址
	 * @param output
	 *                     输出流
	 * @param needCompress
	 *                     是否压缩LOGO
	 * @throws Exception
	 */
	public static void encode(String content , String logoPath , OutputStream output , boolean needCompress)
			throws Exception {
		BufferedImage image = QrCodeUtils2.createImage(content , logoPath , needCompress);
		ImageIO.write(image , FORMAT , output);
	}

	/**
	 * 生成二维码
	 *
	 * @param content
	 *                内容
	 * @param output
	 *                输出流
	 * @throws Exception
	 */
	public static void encode(String content , OutputStream output) throws Exception {
		QrCodeUtils2.encode(content , null , output , false);
	}

	/**
	 * 解析二维码
	 *
	 * @param file
	 *             二维码图片
	 * @return
	 * @throws Exception
	 */
	public static String decode(File file) throws Exception {
		BufferedImage image;
		image = ImageIO.read(file);
		if (image == null) {
			return null;
		}
		BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		Hashtable<DecodeHintType , Object> hints = new Hashtable<DecodeHintType , Object>();
		hints.put(DecodeHintType.CHARACTER_SET , CHARSET);
		result = new MultiFormatReader().decode(bitmap , hints);
		String resultStr = result.getText();
		return resultStr;
	}

	/**
	 * 解析二维码
	 *
	 * @param path
	 *             二维码图片地址
	 * @return
	 * @throws Exception
	 */
	public static String decode(String path) throws Exception {
		return QrCodeUtils2.decode(new File(path));
	}

	public static void main(String[] args) throws Exception {
		
		String text = "{\"id\":\"divngmf\"}";
		//不含Logo  
		String string = QrCodeUtils2.encode(text , null , "/pic" , true);
		System.err.println(string);
		//含Logo，不指定二维码图片名  
		//QrCodeUtils2.encode(text, "/Users/ianly/Documents/picture/google-icon.jpg", "/Users/ianly/Documents/picture/", true);
		//含Logo，指定二维码图片名  
		//		QrCodeUtils2.encode(text , "/Users/ianly/Documents/picture/google-icon.jpg" , "/Users/ianly/Documents/picture" ,
		//				"qrcode" , true);
	}
}
